A group of state and local election officials from around the United States are warning the U.S. Postal Service that mail delivery problems and inadequate staff training could disenfranchise voters as municipalities prepare for the 2024 election.

“Over the course of the last year, election officials across the country have raised serious questions about processing facility operations, lost or delayed election mail, and front-line training deficiencies impacting USPS’s ability to deliver election mail in a timely and accurate manner,” the officials wrote in a Wednesday letter to USPS Postmaster Louis DeJoy obtained by the Washington Examiner.